A lightweight JavaScript library that converts numeric price values into their written word form in Polish, e.g., "123.45" → "sto dwadzieścia trzy złote 45/100".

Useful for invoices, receipts, and any official documents requiring a price written in words.

Features:
- Handles złoty and grosz values
- Formats grosz as a fraction (e.g., 23/100)
- Configurable currency units (złoty/zł, grosz/gr)